Make TabContents own its infobar delegates....

chrome/browser/gtk/translate/after_translate_infobar_gtk.cc

Index: chrome/browser/gtk/translate/after_translate_infobar_gtk.cc
===================================================================
--- chrome/browser/gtk/translate/after_translate_infobar_gtk.cc	(revision 65711)
+++ chrome/browser/gtk/translate/after_translate_infobar_gtk.cc	(working copy)
@@ -65,6 +65,9 @@
 }
 
 void AfterTranslateInfoBar::OnOriginalLanguageModified(GtkWidget* sender) {
+  if (!delegate())
+    return;
+
   int index = GetLanguageComboboxActiveId(GTK_COMBO_BOX(sender));
   if (index == GetDelegate()->original_language_index())
     return;
@@ -77,6 +80,9 @@
 }
 
 void AfterTranslateInfoBar::OnTargetLanguageModified(GtkWidget* sender) {
+  if (!delegate())
+    return;
+
   int index = GetLanguageComboboxActiveId(GTK_COMBO_BOX(sender));
   if (index == GetDelegate()->target_language_index())
     return;
@@ -87,13 +93,16 @@
 }
 
 void AfterTranslateInfoBar::OnRevertPressed(GtkWidget* sender) {
-  GetDelegate()->RevertTranslation();
+  if (delegate())
+    GetDelegate()->RevertTranslation();
 }
 
 void AfterTranslateInfoBar::SetOriginalLanguage(int language_index) {
-  GetDelegate()->SetOriginalLanguage(language_index);
+  if (delegate())
+    GetDelegate()->SetOriginalLanguage(language_index);
 }
 
 void AfterTranslateInfoBar::SetTargetLanguage(int language_index) {
-  GetDelegate()->SetTargetLanguage(language_index);
+  if (delegate())
+    GetDelegate()->SetTargetLanguage(language_index);
 }